310 Flame Ionization Detector (FID)
Theory of operation
2 of 24
Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
sensor, and a non-adjustable restrictor frit. The makeup gas and hydrogen lines
merge before entering the detector.
Figure 310-2 EPC detector flow
Manually controlled detector
The manually controlled FID has three pneumatic supply lines for air, hydrogen
and makeup gas. All three lines have an on/off solenoid valve and a non-
adjustable restrictor frit. In addition, the makeup gas line has a pressure
regulator to change flow without changing supply pressure. The makeup gas
and hydrogen lines merge before entering the detector.
Filter
frits
Proportional
valves
Restrictors
Air in
H
2
in
Makeup in
PS
PS
PS
Vent
Pressure
sensors
Pressure
control loops
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